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aliina [53]
3 years ago
14

If we add 50 Joules of thermal energy to a heat engine, and that heat engine does 30 Joules of work, how much thermal energy is

left over?
20 Joules

10

None

All of it
Physics
1 answer:
Natalka [10]3 years ago
7 0

Answer:

The correct answer should be

A. 20 Joules

Explanation:

I'm taking the K12 Unit Test: Energy - Part 1 right now

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A light flashes at position x=0m. One microsecond later, a light flashes at position x=1000m. In a second reference frame, movin
padilas [110]

Answer:

To the right relative to the original frame.

Explanation:

In first reference frame <em>S</em>,

Spatial interval of the event, \rm \Delta x=1000\ m-0\ m=1000\ m.

Temporal interval of the event, \rm \Delta t = 1\ \mu s=10^{-6}\ s.

In the second reference frame <em>S'</em>, the two flashes are simultaneous, which means that the temporal interval of the event in this frame is \rm \Delta t'=0\ s.

The speed of the frame <em>S' </em>with respect to frame <em>S</em> = v.

According to the Lorentz transformation,

\rm \Delta t'=\dfrac{1}{\sqrt{1-\dfrac{v^2}{c^2}}}\left( \Delta t-\dfrac{v\Delta x}{c^2}\right ).\\\\Since,\ \Delta t'=0,\\\therefore \dfrac{1}{\sqrt{1-\dfrac{v^2}{c^2}}}\left( \Delta t-\dfrac{v\Delta x}{c^2}\right )=0\\\Rightarrow \Delta t-\dfrac{v\Delta x}{c^2}=0\\\dfrac{v\Delta x}{c^2}=\Delta t\\v=\dfrac{c^2\Delta t}{\Delta x }.\\\\Also, \ \Delta t,\ \Delta x>0\ \Rightarrow v>0.

And positive v means the velocity of the second frame<em> </em><em>S'</em> is along the positive x-axis direction, i.e., to the right direction relative to the original frame <em>S</em>.

7 0
3 years ago
A person jogs eight complete laps around a 400-m track in a total time of 14.2 min . calculate the average velocity, in m/s.
White raven [17]
Meters per second, and the time is in minutes, so 14.2 times 60(how many seconds in 1 minute) is 852 seconds then velocity is meters divided by seconds, so 400 divided by 852 is 0.47 m/s rounded to the hundredths place
6 0
3 years ago
A bar magnet has five lines of force cutting one square centimeter (1 cm2). Assuming that each line of force represents 30 Wb of
user100 [1]

Answer:

The magnetic flux density is 3 x 10⁵ Wb/m²

Explanation:

Given;

magnetic flux of each line of force, Ф = 30 Wb

area of the bar magnet, A = 1 cm² = 1 x 10⁻⁴ m²

The flux density of the magnet is the measure of the concentration of the magnetic flux per unit area. The unit is Wb/m² or Tesla.

B = Ф / A

B = 30 / (1 x 10⁻⁴ )

B = 3 x 10⁵ Wb/m²

Therefore, the magnetic flux density is 3 x 10⁵ Wb/m²

4 0
3 years ago
Determine which factors will increase the reaction rate and which factors will decrease te reaction rate.
Elodia [21]

Answer: increase reaction rate side : increase surface area

Increase temperature

Add a catalyst

Decrease reaction rate side :

Decrease surface area

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Decrease concentration

Explanation:

Got it right

8 0
4 years ago
Fossils provide evidence about all of the following except
bixtya [17]
I am not sure of the answer but I think that the answer is a
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